Citation: Guihua Song, Haifang Yang, Yafei Sun, Jingyi Wang, Weidong Qu, Qiang Zhang, Lingjuan Ma, Yuanyuan Feng. Promoting effects of Fe₂O₃ to Pt electrocatalysts toward methanol oxidation reaction in alkaline electrolyte[J]. Chinese Journal of Catalysis, ;2017, 38(3): 554-563. doi: 10.1016/S1872-2067(17)62773-6 shu

Promoting effects of Fe₂O₃ to Pt electrocatalysts toward methanol oxidation reaction in alkaline electrolyte

Key Laboratory of Life-Organic Analysis, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China

Received Date: 23 November 2016
Revised Date: 23 December 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21403125, 21403124) and the Scientific Research Foundation for the Outstanding Young Scientist of Shandong Province (BS2011NJ009).

Fe₂O₃ nanorods and hexagonal nanoplates were synthesized and used as the promoters for Pt electrocatalysts toward the methanol oxidation reaction (MOR) in an alkaline electrolyte. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry and chronoamperometry. The results show that the presence of Fe₂O₃ in the electrocatalysts can promote the kinetic processes of MOR on Pt, and this promoting effect is related to the morphology of the Fe₂O₃ promoter. The catalyst with Fe₂O₃nanorods as the promoter (Pt-Fe₂O₃/C-R) exhibits much higher catalytic activity and stability than that with Fe₂O₃ nanoplates as the promoter (Pt-Fe₂O₃/C-P). The mass activity and specific activity of Pt in a Pt-Fe₂O₃/C-R catalyst are 5.32 A/mg_Pt and 162.7 A/m_Pt², respectively, which are approximately 1.67 and 2.04 times those of the Pt-Fe₂O₃/C-P catalyst, and 4.19 and 6.16 times those of a commercial PtRu/C catalyst, respectively. Synergistic effects between Fe₂O₃ and Pt and the high content of Pt oxides in the catalysts are responsible for the improvement. These findings contribute not only to our understanding of the MOR mechanism but also to the development of advanced electrocatalysts with high catalytic properties for direct methanol fuel cells.
- Platinum,
- Ferric oxide,
- Promoting effect,
- Methanol electrooxidation reaction,
- Alkaline electrolyte
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Promoting effects of Fe₂O₃ to Pt electrocatalysts toward methanol oxidation reaction in alkaline electrolyte